/**
 * ANSItex definitions
 */

var ACTION_EXIT				=99;		/* Exit the script							*/
var ACTION_RELOAD			=1;		/* Reload the current frame					*/
var ACTION_GOTO				=2;		/* Goto a specific frame					*/
var ACTION_BACKUP			=3;		/* Goto previous frame						*/
var ACTION_NEXT				=4;		/* Goto next frame							*/
var ACTION_TERMINATE		=5;		/* Terminate the session					*/
var ACTION_SUBMITRF			=6;		/* Submit form contents						*/
var ACTION_STAR				=7;		/* Star command entry						*/

var MODE_BL					=1;		/* Typing * command on baseline				*/
var MODE_FIELD				=2;		/* Field Input								*/
var MODE_SUBMITRF			=3;		/* Asking if form should be submitted		*/
var MODE_RFNOTSENT			=4;		/* Response frame not sent					*/
var MODE_RFSENT				=5;		/* Response frame sent						*/
var MODE_RFERROR			=6;		/* Response frame error						*/

var FRAME_LENGTH			=22;	/* Length of a frame						*/
var FRAME_WIDTH				=80;	/* Width of a frame							*/
var FRAME_HEADER			=56;	/* Size of page owner (length)				*/
var FRAME_PAGENUM			=12;	/* Size of page number (length with a-z)	*/
var FRAME_COST				= 9;	/* Size of cost	(length without unit)		*/
var FRAME_COSTUNIT			='c';	/* Unit of cost								*/

var FRAME_TYPE_INFO			='i';	// Information Frame, requires no response after viewed
var FRAME_TYPE_TERMINATE	='t';	// Terminate Frame, contents displayed and then carrier dropped
var FRAME_TYPE_EXTERNAL		='x';	// Frame the calls an External Method
									// Contents indicate the method to be called with arguments
var FRAME_TYPE_RESPONSE		='r';	// Response frame, input fields are embedded in the frame and after input the
									// response will be submitted to the Service Provider, or to a method
var FRAME_TYPE_LOGIN		='l';	// Login frame, enables the user to authenticate to the system, or to a CUG

var MSG_SENDORNOT			='\1n\1h\1GKEY 1 TO SEND, 2 NOT TO SEND';
var MSG_LOGON				='\1n\1h\1GKEY 1 TO LOGON, 2 TO RETURN';
var MSG_SENT				='\1n\1h\1GMESSAGE SENT - KEY # TO CONTINUE';
var MSG_NOTSENT				='\1n\1h\1GMESSAGE NOT SENT - KEY # TO CONTINUE';
var ERR_NOT_IMPLEMENTED		='\1n\1h\1RNOT IMPLEMENTED YET?';
var ERR_ROUTE				='\1n\1h\1WMISTAKE? \1GTRY AGAIN OR TELL US ON *08';
var ERR_METHOD_NOT_EXIST	='\1n\1h\1WMISTAKE? \1GTRY AGAIN OR TELL US ON *08';
var ACCESS_DENIED			='\1n\1h\1RACCESS DENIED. \1RMISTAKE? TRY AGAIN OR TELL US *08';

var NO_HISTORY_FRAMES		=['980a','98b','981a'];

var SYSTEM_FRAMES			=['AWgBUkEBR04BQlMBWUkBbgE3AWt0ZXgBbg=='];

// Our frame object
function Frame() {
	this.version=1;						// The version of this frame - in case we update functionality and we need to be
										// backwards compatible
	this.frame=null;					// Frame Number [0-9]+
	this.index=null;					// Frame Index [a-z]
	this.owner='';						// The Service Provider owning the frame.
	this.cost=0;						// The cost to view the frame @TODO
	this.content='';					// The frame content

										// Frame's owned by the system where:
										// isPublic is FALSE - the user must be logged in to view it
										// isPublic is TRUE - can be viewed by non-logged in users

										// Frame's owned by Service Providers where:
										// isPublic is FALSE - can only be viewed if a user is
										//          a member of the Service Providers CUG
										// isPublic is TRUE - can be viewed by users (if logged in)

	this.isPublic=false;				// Is this frame accessible to non CUG users
										// If FALSE user must be a member of the CUG to view the frame
	this.isAccessible=false;			// Is this frame available to be accessed
										// If FALSE, only the SP can view/edit the frame

	this.type = FRAME_TYPE_INFO;		// The frame type - see FRAME_TYPES above
	this.key=[ null,null,null,null,null,null,null,null,null,null ];	// Key actions [0-9]

	this.frame_fields = [];				// If a response frame, the embedded fields in the frame

	// Render the frame to the user
	this.render=function(withHeader) {
		owner = base64_decode(this.owner);

		header = '\n\r';

		log(LOG_DEBUG,'- FRAME User: ['+JSON.stringify(user)+']');

		// Dont show the page number on system login page
		if (user.number || (this.type != FRAME_TYPE_LOGIN && NO_HISTORY_FRAMES.indexOf(this.page) == -1)) {
			header = '\1n'+owner+' '.repeat(FRAME_HEADER-console.strlen(owner))+'\1n '+
				'\1W\1H'+this.page+' '.repeat(FRAME_PAGENUM-this.page.length)+' '+
				'\1G\1H'+' '.repeat(FRAME_COST-this.cost.toString().length)+this.cost+FRAME_COSTUNIT+
				(console.screen_columns > 80 ? '\n\r' : '');
		}

		if ((this.type == FRAME_TYPE_LOGIN) || (this.type == FRAME_TYPE_RESPONSE)) {
			return header+this.parse(this.content);
		} else {
			return header+this.content;
		}
	};

	Object.defineProperty(this,'page', {
		get: function() {
			if (this.frame == null || this.index == null) return null;
			return this.frame+this.index;
		}
	});

	Object.defineProperty(this,'fields', {
		get: function() {
			return this.frame_fields;
		}
	});

	Object.defineProperty(this,'accessible',{
		get: function() {
			log(LOG_DEBUG,'- Checking if user can access frame: '+this.page);
			log(LOG_DEBUG,'  - User: '+JSON.stringify(user.number));
			log(LOG_DEBUG,'  - Frame Owner: '+JSON.stringify(this.owner)+', System Frame: '+(SYSTEM_FRAMES.indexOf(this.owner)>-1));

			system_frame = (SYSTEM_FRAMES.indexOf(this.owner)>-1);

			// user.number 0 is unidentified user.
			if (user.number) {
				return (
					(this.isAccessible && this.isPublic) ||
					(this.isAccessible && ! this.isPublic && user.isMember) ||
					(user.isOwner)
				);

			} else {
				return (system_frame && this.isPublic && this.isAccessible);
			}
		}
	});
}

// Load a frame from disk (.tex file)
Frame.prototype.load = function(filename) {
	log(LOG_DEBUG,'Loading frame from: '+filename);

	f = new File(system.mods_dir+'ansitex/text/'+filename+'.tex');
	if (! f.exists || ! f.open('r')) {
		return null;
	}

	try {
		var load = JSON.parse(f.read());

		for (property in load) {
			this[property] = load[property];
		}

		this.content = base64_decode(this.content);

	} catch (error) {
		log(LOG_ERROR,'Frame error: '+error);
		return null;
	}

	log(LOG_DEBUG,'Loaded frame: ['+this.frame+']['+this.index+'] ('+this.page+')');
};

/**
 * Parse the page text, and return the frame as 2 arrays:
 * + First array is all the characters and the position on the frame
 * + Second array is the array of the control codes that changes the color of the character
 *
 * The purpose of this function is to convert any special char sequences there are interpreted directly by Ansitex
 * Currently they are:
 * + ESC _ <value>[;value] ESC \
 *
 * Additionally, for response frames, if the cursor is moved to a field, its to determine what attributes (eg: color)
 * should apply for that field.
 *
 * @param text
 */
Frame.prototype.parse = function(text) {
	var c = 1; // column
	var r = 2; // row (row 1 is the header)
	var output = '';
	this.frame_fields = [];

	// Default Attributes
	f = 39;
	b = 49;
	i = 0;

	for(p=0;p<text.length;p++) {
		// Look for a special character until the end of the frame width
		cte = (r*FRAME_WIDTH - ((r-1)*FRAME_WIDTH+c));
		match = text.substr(p,cte).match(/[\r\n\x1b]/);
		//log(LOG_DEBUG,'SPECIAL CHAR ['+r+'x'+c+'] ['+p+'-'+cte+'] for: '+match);

		if (match == null || match.index) {
			advance = match ? match.index : cte;
			//log(LOG_DEBUG,'INCLUDE: '+text.substr(p,advance));

			output += text.substr(p,advance);
			p += advance;
			c += advance;
			advance = 0;
		}

		// If the frame is not big enough, fill it with spaces.
		byte = text.charAt(p);
		advance = 0;

		switch (byte) {
			// Carriage Return
			case '\r':
				// log(LOG_DEBUG,'CR');
				c=1;
				break;

			// New line
			case '\n':
				// log(LOG_DEBUG,'LF');
				r++;
				break;

			// ESC
			case KEY_ESC:
				advance = 1;
				// Is the next byte something we know about
				nextbyte = text.charAt(p+advance);
				//log(LOG_DEBUG,'ESC ['+r+'x'+c+'] NEXT: '+nextbyte);

				switch (nextbyte) {
					// CSI
					case '[':
						advance++;
						chars = '';

						// Find our end CSI param in the next 50 chars
						matches = text.substr(p+advance,50).match(/([0-9]+[;]?)+([a-zA-Z])/);
						//log(LOG_DEBUG,'CSI ['+r+'x'+c+'] ADVANCE: '+advance+', MATCHES: '+matches+', STRING: '+text.substr(p+advance,50));

						if (! matches) {
							chars += nextbyte;

							break;
						}

						advance += matches[0].length-1;
						chars += nextbyte+matches[0];
						//log(LOG_DEBUG,'CSI ['+r+'x'+c+'] ADVANCE: '+advance+', CHARS: '+chars+', CHARSLEN: '+chars.length);

						switch (matches[2]) {
							// Color CSIs
							case 'm':
								//log(LOG_DEBUG,'CSI m ['+r+'x'+c+'] MATCHES: '+matches[0]+', LENGTH : '+matches[0].length);

								csi = matches[0].substr(0,matches[0].length-1).split(';');
								var num = null;
								for (num in csi) {
									//log(LOG_DEBUG,'CSI m ['+r+'x'+c+'] NUM: '+num+', CSI: '+csi[num]);
									// Intensity
									if (csi[num] >= 0 && csi[num] <= 8) {
										i = csi[num];
										f = 39;
										b = 49;

									// Forground Color
									} else if (csi[num] >= 30 && csi[num] <= 39) {
										f = csi[num];

									// Background Color
									} else if (csi[num] >= 40 && csi[num] <= 49) {
										b = num;
									}
								}
								break;

							// Advance characters
							case 'C':
								//log(LOG_DEBUG,'CSI C ['+r+'x'+c+'] CHARS: '+matches[1]);
								c += parseInt(matches[1]); // Advance our position
								break;

							default:
								log(LOG_DEBUG,'? CSI: '.matches[2]);
						}

						break;

					case ' ':
						log(LOG_DEBUG,'LOOSE ESC? ['+r+'x'+c+'] '+advance);

						break;

					// SOS
					case '_':
						//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] '+advance);
						advance++;

						// Find our end ST param in the next 50 chars
						matches = text.substr(p+advance,50).match(/(([A-Z]+;[0-9a-z]+)([;]?.+)?)\x1b\\/);
						//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] ADVANCE: '+advance+', MATCHES: '+matches+', LENGTH: '+matches[0].length+', STRING: '+text.substr(p+advance,50));

						if (! matches) {
							chars += nextbyte;

							break;
						}

						advance += matches[0].length-1;

						// The last 2 chars of matches[0] are the ESC \
						sos = matches[0].substr(0,matches[0].length-2).split(';');
						//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] ADVANCE: '+advance+', SOS: '+sos);

						var num = null;
						var fieldlen = null;
						for (num in sos) {
							//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] NUM: '+num+', SOS: '+sos[num]);

							switch (num) {
								// First value is the field name
								case '0':
									field = sos[num];
									break;

								// Second value is the length/type of the field
								case '1':
									x = sos[num].match(/([0-9]+)([a-z])/);
									if (! x) {
										log(LOG_ERROR,'SOS FAILED PARSING FIELD LENGTH/TYPE. ['+r+'x'+c+'] '+sos[num]);
										break;
									}

									//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] NUM CHARS: '+x[1]+', TYPE: '+x[2]);
									fieldlen = x[1];
									fieldtype = x[2];
									break;

								// Third field is the char to to use
								case '2':
									fieldchar = sos[num];
									break;

								default:
									log(LOG_ERROR,'IGNORING ADDITIONAL SOS FIELDS. ['+r+'x'+c+'] '+sos[num]);
							}
						}

						if (fieldlen) {
							chars = fieldchar.repeat(fieldlen);
						}

						byte = '';

						this.frame_fields.push({
							ftype: fieldtype,
							flength: fieldlen,
							fchar: fieldchar,
							fname: field,
							r: r,
							c: c,
							attribute: {i:i,f:f,b:b},
							fvalue: '',
						});

						log(LOG_DEBUG,'SOS Field found at ['+r+'x'+(c-1)+'], Type: '+fieldtype+', Length: '+fieldlen+', Attrs: '+JSON.stringify({i:i,f:f,b:b}));

						break;

					default:
						log(LOG_DEBUG,'DEFAULT ['+r+'x'+c+'] '+advance);
				}

				break;

			default:
				c++;
		}

		output += byte;

		if (advance) {
			//log(LOG_DEBUG,'ADVANCE P ['+r+'x'+c+'] '+advance+', NEXT CHAR: '+text.charAt(p+advance)+' ('+text.charCodeAt(p+advance)+')');
			output += chars;
			p += advance;
		}

		if (c>FRAME_WIDTH) {
			c = 1;
			r++;
		}

		/*
		// @todo - If we are longer than FRAME_LENGTH, move the output into the next frame.
		if (r>FRAME_LENGTH) {
			break;
		}
		*/
	}

	return output;
};

this;